Every tool answers curl in plain text. Bare paths like curl ipq.sh/dns print
their own usage.

Your request
  curl ipq.sh               your IP address
  curl ipq.sh/ip            the same, by name
  curl ipq.sh/ip.json       IP, version and country as JSON
  curl -4 ipq.sh            your IPv4 address (-6 for IPv6)
  curl ipq.sh/headers       the headers your client sent
  curl ipq.sh/headers.json  the same as JSON
  curl ipq.sh/ua            your user agent (/ua.json)
  curl ipq.sh/time          the current time in UTC (/time.json)

Check a site
  curl ipq.sh/check/example.com          DNS, TCP, TLS and one HEAD / from every
                                         region
  curl ipq.sh/check/example.com?port=80  plain HTTP on port 80 instead of 443

Traceroute
  curl ipq.sh/trace              traceroute to you from every region
  curl ipq.sh/trace/me           the same, by name
  curl ipq.sh/trace/example.com  traceroute to a site or address

Ping
  curl ipq.sh/ping/example.com  five pings to a site or address from every
                                region
  curl ipq.sh/ping/me           five pings to you

DNS
  curl ipq.sh/dns/example.com          A records, as each region's resolver sees
                                       them
  curl ipq.sh/dns/example.com?type=MX  any of A AAAA CNAME MX NS TXT SOA CAA SRV
                                       PTR
  curl ipq.sh/dns/example.com?mail     MX, SPF and DMARC together
  curl ipq.sh/dns/8.8.8.8              an address looks up its PTR

Ports
  curl ipq.sh/port/22,443  are your own TCP ports reachable from outside (up to
                           five)
  curl -6 ipq.sh/port/443  test your IPv6 address (-4 for IPv4)
  Only ever tests the address you connect from.

GeoIP
  curl ipq.sh/geo              where you are and who routes you
  curl ipq.sh/geo/8.8.8.8      location, network and reverse name of an address
  curl ipq.sh/geo/example.com  the same for each address a name resolves to
  curl ipq.sh/asn/8.8.8.8      the same lookup, by another name

Heartbeats
  curl -d period=1h -d grace=15m -d ntfy=mytopic ipq.sh/heartbeat
      create a check; prints its ping and manage URLs
  curl -d period=1d -d webhook=https://… ipq.sh/heartbeat
      alert a webhook instead; also -d name=…, -d remind=6h
  curl ipq.sh/hb/<id>             ping: the job ran
  curl ipq.sh/hb/<id>/start       the job started
  curl ipq.sh/hb/<id>/fail        the job failed
  curl ipq.sh/hb/<id>/$?          report an exit code; non-zero is a failure
  curl ipq.sh/heartbeat/<manage>  status and recent pings
  curl -d action=test ipq.sh/heartbeat/<manage>
      send a test alert
  curl -d period=2h ipq.sh/heartbeat/<manage>
      change settings
  curl -d action=delete ipq.sh/heartbeat/<manage>
      delete the check
  curl -d ping=<ping URL> ipq.sh/heartbeat/recover
      lost the manage URL: a one-time link goes to the alert destination

Internet health
  curl ipq.sh/health       major services, as nine regions see them
  curl ipq.sh/health.json  the same as JSON

Options
  ?from=nyc,lon  only these regions, on /check, /trace, /ping, /dns and /port
  ?json          JSON instead of text; so does -H 'Accept: application/json'
  curl -4        or -6: pick which of your addresses /trace, /ping/me and /port
                 test
  Regions: nyc New York, sfo San Francisco, sao São Paulo, lon London,
  jnb Johannesburg, blr Bangalore, sgp Singapore, tyo Tokyo, syd Sydney. Combine
  options with &, and quote the URL in your shell:
  curl 'ipq.sh/dns/example.com?type=TXT&from=lon&json'.